Quarantined America practically handed the sports leagues a captive audience, as the nation thirsts for entertainment. Major-league sports should have had a wild response, with its unscripted action and athletic feats. And in fact, both the NBA and Major League Baseball got off to pretty decent starts. The NBA scored its second-highest ratings of the season in its Thursday re-opener: A thrilling showdown between the Los Angeles Lakers and the Los Angeles Clippers drew 3.4 million total viewers, more than doubling the network’s average viewership for a regular season telecast. To put that number into perspective, that represents the...